/*
 * Copyright (C) 2007-2015 FBReader.ORG Limited <contact@fbreader.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package com.koolearn.klibrary.text.view.style;

// 文字的各种样式

import com.koolearn.klibrary.core.filesystem.ZLFile;
import com.koolearn.klibrary.core.util.MiscUtil;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

class SimpleCSSReader {
    private enum State {
        EXPECT_SELECTOR,
        EXPECT_OPEN_BRACKET,
        EXPECT_NAME,
        EXPECT_VALUE,
        READ_COMMENT,
    }

    private State myState;
    private State mySavedState;
    private Map<Integer, ZLTextNGStyleDescription> myDescriptionMap;
    private Map<String, String> myCurrentMap;
    private String mySelector;
    private String myName;

    Map<Integer, ZLTextNGStyleDescription> read(ZLFile file) {
        myDescriptionMap = new LinkedHashMap<Integer, ZLTextNGStyleDescription>();
        myState = State.EXPECT_SELECTOR;

        InputStream stream = null;
        try {
            stream = file.getInputStream();
            final BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
            String line;
            while ((line = reader.readLine()) != null) {
                for (String token : MiscUtil.smartSplit(line)) {
                    processToken(token);
                }
            }
        } catch (IOException e) {
        } finally {
            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException e) {
                }
            }
        }

        return myDescriptionMap;
    }

    private void processToken(String token) {
        if (myState != State.READ_COMMENT && token.startsWith("/*")) {
            mySavedState = myState;
            myState = State.READ_COMMENT;
            return;
        }

        switch (myState) {
            case READ_COMMENT:
                if (token.endsWith("*/")) {
                    myState = mySavedState;
                }
                break;
            case EXPECT_SELECTOR:
                mySelector = token;
                myState = State.EXPECT_OPEN_BRACKET;
                break;
            case EXPECT_OPEN_BRACKET:
                if ("{".equals(token)) {
                    myCurrentMap = new HashMap<String, String>();
                    myState = State.EXPECT_NAME;
                }
                break;
            case EXPECT_NAME:
                if ("}".equals(token)) {
                    if (mySelector != null) {
                        try {
                            myDescriptionMap.put(
                                    Integer.valueOf(myCurrentMap.get("fbreader-id")),
                                    new ZLTextNGStyleDescription(mySelector, myCurrentMap)
                            );
                        } catch (Exception e) {
                            // ignore
                        }
                    }
                    myState = State.EXPECT_SELECTOR;
                } else {
                    myName = token;
                    myState = State.EXPECT_VALUE;
                }
                break;
            case EXPECT_VALUE:
                if (myCurrentMap != null && myName != null) {
                    myCurrentMap.put(myName, token);
                }
                myState = State.EXPECT_NAME;
                break;
        }
    }
}
